ducas



C. DUCS.

sEcTloNAL me Box coNsRucnoN.

APPLICATION HLED IULY 24,1915. 1,322,484., Patented Nov. 18, 1919. 2 SHEETSMSHEET I.

l @Q1 I m will n C. DUCAS. SECTIONAL FIRE B0X CONSTRUCTION.

APPLICATloN HLED JULY 24,1916.

Patented Nov. 18, 1919.

2 SHEETSSHEET 2.

CHARLES nUcAs, or New. 5503K..N.Y.,}Assl1voa, BY Mnsnn ASSIGNMENTS, To LUKENS `srnnr. COMPANY, AconronATiQNor PBNNsYLynNrA.

,SECTIQNAL-FIRE-BOX CONSTRUCTION.

.Specification of Letters Patent. PatenjgQdNOV, 18, 1919,

.Application filed Ju1y,24,i1916. Serial No.110,9.13.

a sectional fire-box construction V.in which the sections of the :fire-,boxes are connected with the wagon top in such a manner as .to permit. relative movement of the-same soas to avoid damage dueto differences in'expansion and contraction .in .the ,various zparts. More particularly the object of myinvention is to provide aiconstruction ofithisocharacter in which the iresbox sections-may move `vertically and 4horizontally in a transverse direction, as well as longitudinally of the fire-box with regard to the wagon top, without producing damage to the parts due to differences in expansion and contraction. A further object of my invention is to provide for rocking movement between the firebox sections and the wagon top so as to avoid such damage.

While my invention is capable of embodiment in many different forms, for the purposes of illustration I have shown only certain forms thereof in the accompanying drawings, in which- Figure 1 is a vertical section of a portion of the lire-box made in accordance with my invention; Fig. 2 is a horizontal section through the same; Fig. 3 is a vertical section of a modified form of fire-box made in accordance with my invention; and Fig. 4 is a horizontal section through thesame.

ln the drawings, reference being had to Figs. 1 and 2, I haveshown a mud ring 1 having attached to the outside thereof a plurality of wagon top sections 2, between the edges of which there are located stay sheets 3, 'preferably in the form of flexible or yieldable plates, rivets 4 being provided for connecting the edges of the sections 2 and the stay sheets 3 together. To the inner surface of the mud ring 1 there are connected a plurality of fire-box sections 5 between the edges of which there are located strips 16., .,rivets7 being provided for connetting thestrips l6 with the fire-box sections 5. The strips 6 are widened at the top of-:rthe-fire-box to provide extensions 8 which are connected ,by a' plurality vof bars 9. to the yupper :portions of the stay sheets 3. At thesdesofgth'e fire-box sections 5 the edges thereof are extended beyond the rivets 7 to form flanges 10 having holes 11 -to receive pins 12 whichl are fxedly .secured to fthe stay sheetse. yThe holes 11 are larger in diameter than 'thepins 12,.the pins being 'located as shown in Figs. 1 and '2 adjacent 'to the outer sidesfof said'holes 11. 'Ehemodilication yof my invention shown in Figs. 3 and 4 is constructedvthe same as the ymodification Ypreviously described exceptithat instead lof stay sheets 3 :there are folded ,stay Y.sheets *13, located vbetween the wagon. topysections 2 said 'folded stay sheets 13' thaving their :folded edges yprovided with holes 114 to :receive rods 15 and beingprovided with rectangular recesses 16 along said folded edges; and except that instead of the strips 6 and the flanges 10 there are provided inner folded stay sheets 17 having holes 18 at their folded edges to receive the rods 15 and rectangular recesses 19 alternating with recesses 1G, the inner folded stay sheets 17 being` themselves connected to the bars 9.

In the operation of the form of my invention shown in Figs. 1 and 2, in the use of the tire-box any differences in expansion and contraction in the fire-box sections 5 relative to the wagon top sections 2 will not result in any damage to the parts, since the sections 2 and 5 may move with regard to one another to a certain extent. both vertically and horizontally in a transverse plane, owing to the loose connection between the pin 12 and the flanges 10. Relative longitudinal movement between said sections also is permitted by flexing of the stay sheet 3, since such stay sheet may be made more or less flexible, and the difference in size between pin 12 and holes 11 will permit said pin to rock therein so as not to resist such longitudinal movement. At the same time the sections 5 and 2 are adequately support ed from one another as the greatest pressure is the pressure tending to separate sections 5 and sections 2 due to the pressure of the steam between said sections, while at the same time the pins 12 are located in the holes 11 in such a position as toV prevent any movement of separation by the sections and 2. Y j

'I` he form of myV invention shown in Figs. 3 and 4: operates in the same manner as the modification already described so far as the kindof movements is concerned except that not so Vlgreat a'degree of movement 1s permitted horizontally in the plane of each of the fire-box sections 5, while at the same time a greater degree of rocking .and pivotal movement is permitted on each vertical axis.

said sheet being` fixedly connected to a side' of one of said sections', and havinga loose connection with the adjacent sideof they remaining section.

2. In combination, pair of U-shaped firebox sections, a pair of -U-shaped outer sections spaced therefrom, a stay sheet se- Y cured between adjacent sides of one of Said pairs of sections, and means loosely securing said stay sheet betw'eenadjacentsides of theV remaining pair of sections.

V3. In combination, aipair of U-shaped rebox sections, a pairof U-shaped outer sections spaced therefrom, a stay sheet se-Y cured Vbetween adjacent sides of one of said pairs of,v sections, -and a pin and slot connection between said stay sheet and adjacent Asides of the remaining pair of sections. Y

4. In combination, a pair of U-shaped .rebox sections, a pair of U-shaped, outer sections spaced therefrom, a flexible stay sheet secured between adjacent sides of one of'said pairs of sections, and means loosely securing said stay shee-t between adjacent sides of the remaining pair of sections.

5. In combination, a pair of U-shaped` rebox sections, a pair of U-shaped outer sections, a flexible stay sheet secured between adjacent sides of one of said pairs of sections, and a pin vand slotconnection between said stay sheet and adjacent sides of the remaining pair of sections.

. 6. In combination, a pair of U-shaped irebox` sections, a pair of U-shaped outer sections inclo'singy the same, a stay sheet secured. between adjacent sides of one of said pairs of sections, va'spacing strip secured between adjacent sides of the Vremaining pair of'sections, and means loosely securing said stay sheet'between said last mentioned sides in line with said spacing. strip.

In testimony that Irclaim the foregoing I have hereunto set my hand.

' CHARLES DUCAS. 

